It seems that WBC fonts in all 3 games have been packed in XCR files in BMP format. Is there any way to transform them into some usable font format?

Thanks in advance.

WBC1 uses the font named Morpheus. You can easily find it on the internet.
WBC2 &3 use custom fonts. The bitmaps used can be extracted from the xcr using an xcr editor - also easily found on the internet.

I have already extracted them. They are in BMP format. How can I use them in DOC and TXT files, i.e. how can I transform them into some font format readable by Windows office applications ?

I'm sorry to say this but that's not possible. In order to use those, you'll have to make a font file.

edit / wrong post